EP 4389783 A1 20240626 - CATALYST TRANSITION PROCESS
Title (en)
CATALYST TRANSITION PROCESS
Title (de)
KATALYSATORÜBERGANGSVERFAHREN
Title (fr)
PROCÉDÉ DE TRANSITION DE CATALYSEUR
Publication
Application
Priority
EP 22215204 A 20221220
Abstract (en)
A process for transitioning between two different catalysts during the production of polypropylene homo- or copolymers in a continuous multistage polymerisation reaction , the process comprising the steps of:a) polymerising propylene and optionally comonomers in a multi stage polymerisation reactor system comprising a prepolymerization reactor, a subsequent slurry reactor and thereafter a gas phase reactor in the presence of a first catalyst;b) discontinuing the feed of the first catalyst to the prepolymerization reactor;c) subsequently introducing, propylene, optionally comonomers, and a second catalyst into the prepolymerization reactor, and further introducing an aluminium alkyl into the polymerization reactor simultaneously with the introduction of the second catalyst;d) polymerising propylene and optionally comonomers in the multistage polymerisation reactor system in the presence of the second catalyst;wherein the first catalyst is a Ziegler-Natta catalyst and the second catalyst is a single site catalyst; andwherein the amount of aluminium alkyl fed in step c) is 0.5 to 10.0 g per ton of total propylene fed into the prepolymerisation reactor and the slurry reactor in steps c) and d).
IPC 8 full level
C08F 110/06 (2006.01)
CPC (source: EP)
C08F 110/06 (2013.01); C08F 4/65912 (2013.01); C08F 4/65916 (2013.01); C08F 2410/05 (2013.01)
C-Set (source: EP)
Citation (applicant)
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Citation (search report)
- [XI] EP 1316566 B1 20050330 - FINA TECHNOLOGY [US]
- [A] EP 2216347 A1 20100811 - BOREALIS AG [AT]
- [A] EP 3237458 B1 20220622 - SABIC GLOBAL TECHNOLOGIES BV [NL]
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC ME MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA
Designated validation state (EPC)
KH MA MD TN
DOCDB simple family (publication)
DOCDB simple family (application)
EP 22215204 A 20221220; EP 2023087142 W 20231220